Finally fixed my "hitting the wall" problem. It was neither of what I had predicted. It ended up being a bad BAP(MAP) sensor. (a9l swap) I have no idea what this sensor does, but when we changed it out, it fixed the problem. Now it lights the tires up all the way to 6k in 1st & 2nd gear.
Nacho, keep us updated. I've never seen a BAP cause an issue like this (unless someone hooked it to manifold vac or something like that). This is an interesting fix (I don't wanna know how you knew to replace it, but good work!).
I didn't know how or why, my buddy just suggested it and since he had one lying around, we tried it out and it worked fine. The sensor isn't hooked up to any vacuums, as a matter of fact, we placed it next to the a9l in that small compartment. What does the BAP sensor do?
The BAP is the Barometric pressure sensor. It simply notes how far above sea-level you are (on your T4 processor, the BAP was integral to the computer itself. If the BAP took a dump, you'd need a new puter).
On SD cars, the MAP (MAP was the precursor to the BAP - they are essentially the same sensor but perform different functions for SD vs MAF) is connected to manifold vacuum and this connection is critical for a SD car to run. When MAF came around on foxes, they just disconnected the vac line and left the sensor sitting there in the engine compartment.
I'd have put it where you did, next to the computer.
Perzactly! That's why I asked for a follow-up to make sure this was indeed the fix for your problem. If a BAP totally took a big flying poop and reported that you were on the moon, it could mess things up. But otherwise, it generally does not go out of calibration.
Your old one could have really been screwed up though (checking the electrical side of it vs your new one might have showed the difference if there was one).